Time delay mechanism and injection device

Abstract

The invention relates to a time delay mechanism and an injection device. The time delay mechanism comprises a first component, a second component, a first sealing piece, damping liquid and filling fluid. The second member is movable relative to the first member from a first position to a third position via a second position. When the second part is located at the first position, a damping cavity for preventing damping liquid from flowing out is formed; when the second part moves from the first position to the second position, the first part and the second part are matched through the first sealing piece to form a sliding sealing structure for preventing the damping liquid from passing through, and the damping cavity is compressed and compresses and / or discharges the filling fluid; when the second part moves from the second position to the third position, the damping cavity communicates with a channel for the damping liquid to flow out, and the damping cavity is compressed to extrude the damping liquid out of the damping cavity. The damping liquid can be prevented from flowing out of the damping cavity before the time delay mechanism is started, and then the accuracy of the time delay mechanism is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of injection devices, and in particular to a time delay mechanism and an injection device. Background Art

[0002] The injection device can inject the medicine contained therein into the patient's body from the patient's injection site through a needle. It usually includes a shell, a medicine bottle, a starting mechanism and a pushing mechanism, wherein the medicine bottle is installed in the shell, and the medicine bottle includes a bottle body, a medicine placed in the bottle body, a needle at the far end of the bottle body and a movable piston at the proximal end of the bottle body. The pushing mechanism is used to push the movable piston to push the medicine in the bottle body from the needle into the patient's body, and the starting mechanism is used for the user to operate to trigger the pushing action of the pushing mechanism.

[0003] During the actual injection, the injected drug usually takes some time to be completely discharged from the medicine bottle, and the drug also takes some time to disperse at the injection site. If the needle of the injection device is pulled out from the injection site immediately after the injection is completed, the drug may not be completely discharged from the medicine bottle, and / or the drug may flow out from the injection site, which will cause a portion of the drug to not be completely injected into the patient. The instructions for use of some injection devices will prompt the user to wait for a few seconds after the injection is completed before pulling out the needle, so that the needle can stay at the injection site for a period of time; but the time to pull out the needle depends on the user, which is not convenient for the user.

[0004] To this end, some injection devices are equipped with a delay mechanism, which cooperates with the pushing mechanism. When the pushing mechanism pushes the movable piston of the medicine bottle to the farthest end, the delay action of the delay mechanism is triggered and a visual / auditory / tactile signal is given after a period of time to prompt the user that the needle can be pulled out of the injection site at this time; and some injection devices further include a needle return mechanism for automatically removing the needle from the patient's injection site. The needle return mechanism cooperates with the delay mechanism. When the pushing mechanism pushes the movable piston of the medicine bottle to the farthest end, the delay action of the delay mechanism is triggered and the needle return action of the needle return mechanism is triggered after a period of time to automatically remove the needle from the patient's injection site.

[0005] In the related art, the delay mechanism mainly includes a delay component that can move and a damper for providing resistance for the delay component; wherein the delay component is usually powered by a power spring, and the damper cooperates with the delay component to form a damping chamber with a preset channel, and the damping chamber contains a high-viscosity liquid; the moving delay component will gradually compress the damping chamber and squeeze the high-viscosity liquid out of the damping chamber through the channel, and use the resistance of the high-viscosity liquid to delay the movement of the delay component to achieve the delay function, but some high-viscosity liquid may also flow out of the damping chamber through the channel before the delay mechanism is activated, which will reduce the total delay duration of the delay mechanism and affect the accuracy of the delay mechanism. Summary of the invention

[0006] One of the purposes of the present application is to provide a delay mechanism that can prevent the damping liquid from flowing out of the damping chamber before the delay mechanism is activated, thereby shortening the delay time, thereby ensuring the accuracy of the delay mechanism.

[0007] The second object of the present application is to provide an injection device, which includes the delay mechanism provided by one of the above objects. The injection device can start the delay mechanism after the pushing mechanism completes the pushing action, and give a prompt signal after the delay mechanism completes the delay action and / or trigger the needle return action after the delay mechanism completes, thereby providing convenience for the user of the injection device.

[0008] One of the purposes of this application is to provide a time delay mechanism that adopts the following technical solution:

[0009] A time delay mechanism includes a first component, a second component, a first seal, a damping liquid and a filling fluid;

[0010] The first component is sleeved with the second component, and the second component can move from a first position to a third position via a second position relative to the first component;

[0011] When the second component is in the first position, the first component, the second component and the first sealing member cooperate to form a damping chamber for preventing the damping liquid from flowing out, and the damping liquid and the filling fluid are contained in the damping chamber;

[0012] During the movement of the second component from the first position to the second position, the first component cooperates with the second component through the first seal to form a sliding seal structure that blocks the damping liquid from passing through, and the damping chamber is compressed and compresses and / or discharges the filling fluid;

[0013] During the movement of the second component from the second position to the third position, the damping chamber is connected with a passage for the damping liquid to flow out, the damping chamber is compressed and the damping liquid is squeezed out of the damping chamber.

[0014] By adopting the above technical scheme, before the delay mechanism is triggered and started, the damping chamber is in a sealed state to limit the outflow of the damping liquid, thereby effectively preventing the damping liquid from flowing out of the damping chamber before the delay mechanism is started and shortening the delay time, thereby ensuring the accuracy of the delay mechanism; and after the delay mechanism is triggered and started, the first component will move a certain distance relative to the second component, compress the damping chamber and form a channel for the damping chamber to flow out of the damping liquid, and continue to compress the damping chamber in the subsequent movement of the first component, thereby squeezing the damping liquid out of the damping chamber, and providing resistance to the movement of the first component during the process of the damping liquid being squeezed out, thereby delaying the time for the first component to move to the third position, thereby realizing the delay function of the delay mechanism.

[0015] Further, the first seal is located between the first component and the second component, and one of the first component and the second component remains stationary relative to the first seal, and the other includes a sealing fitting section and a clearance fitting section; during the movement of the second component from the first position to the second position, the first seal cooperates with the sealing fitting section so that the first component and the second component form the sliding sealing structure through the first seal; during the movement of the second component from the second position to the third position, the first seal cooperates with the clearance fitting section so that a gap is formed among the first seal, the first component and the second component to form a channel for the damping liquid to flow out of the damping chamber.

[0016] Furthermore, a guide groove is provided on the surface of the clearance fitting section, and a gap is formed between the bottom of the guide groove and the first sealing member to form a channel for the damping liquid to flow out of the damping chamber.

[0017] Furthermore, the delay mechanism also includes a accommodating chamber, and during the movement of the second component from the second position to the third position, the channel connected to the damping chamber for the damping liquid to flow out is connected to the accommodating chamber, and the damping liquid can be squeezed to flow from the damping chamber to the accommodating chamber.

[0018] Furthermore, the delay mechanism also includes a second seal, and the first component, the second component, the first seal and the second seal cooperate to form the accommodating chamber; one of the first component and the second component remains stationary relative to the second seal and is provided with a groove body section, and the other slides relative to the second seal and maintains sealing, and the groove body section is located between the first seal and the second seal and constitutes a partial cavity wall of the accommodating chamber.

[0019] Furthermore, the slot body section includes support ribs arranged at intervals, a slot body is formed between two adjacent support ribs, and the support rib is provided with a conducting opening for conducting between two adjacent slot bodies.

[0020] Furthermore, the first component includes a containing space with a bottom, a section of the second component extends into the containing space, and the end of the second component extending into the containing space and the bottom of the containing space respectively constitute part of the cavity wall of the damping chamber.

[0021] Furthermore, the first component includes a cylinder, a cover and a third sealing member, an opening at one end of the cylinder is covered by the cover to form the accommodating space with a bottom, and the cylinder and the cover form a sealing structure through the third sealing member to prevent the damping liquid from flowing out.

[0022] Further, the first component translates relative to the second component to move from the first position to the third position via the second position; or the first component rotates relative to the second component to move from the first position to the third position via the second position.

[0023] The second object of the present application is to provide an injection device adopting the following technical solution:

[0024] An injection device, comprising a pushing mechanism and the above-mentioned delay mechanism, wherein the relative movement between the first component and the second component in the delay mechanism is triggered when the pushing action of the pushing mechanism is completed;

[0025] When the first component moves to the third position relative to the second component, a prompt signal is given, and / or when the first component moves to the third position relative to the second component, a needle return action is triggered.

[0026] By adopting the above technical solution, the injection device can start the delay mechanism after the pushing mechanism completes the pushing action, and give a prompt signal after the delay mechanism completes the delay action, so that the user can pull out the needle based on the signal, or trigger the needle return action after the delay mechanism is completed, thereby providing convenience for the user of the injection device.

[0027] In summary, this application at least includes the following beneficial effects:

[0028] Before the delay mechanism is triggered and started, the damping chamber is in a sealed state to limit the outflow of the damping liquid, thereby effectively preventing the damping liquid from flowing out of the damping chamber before the delay mechanism is started and shortening the delay time, thereby ensuring the accuracy of the delay mechanism; after the delay mechanism is triggered and started, the first component will move a certain distance relative to the second component, compress the damping chamber and form a channel for the damping chamber to flow out of the damping liquid, and continue to compress the damping chamber in the subsequent movement of the first component, thereby squeezing the damping liquid out of the damping chamber, and providing resistance to the movement of the first component in the process of the damping liquid being squeezed out, thereby delaying the time for the first component to move to the third position, thereby realizing the delay function of the delay mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the second component during translation from the first position to the second position in the embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the second component during translation from the second position to the third position in the embodiment of the present application;

[0031] Figure 3 is a schematic diagram of the second component in the third position in the embodiment of the present application;

[0032] Figure 4 is a schematic diagram of another embodiment of the present application during the translation of the second component from the first position to the second position;

[0033] Figure 5 is a schematic diagram showing a clearance fit section of a first component in an embodiment of the present application;

[0034] Figure 6 is a schematic diagram showing a clearance fitting section of a first component in another embodiment of the present application;

[0035] Figure 7 is a schematic diagram showing a tank section of the second component in an embodiment of the present application;

[0036] Figure 8 is a cross-sectional view showing a tank section of the second component in an embodiment of the present application;

[0037] Fig. 9 is a cross-sectional view showing an example of rotation of the second component relative to the first component in an embodiment of the present application;

[0038] Fig.10 is an exploded schematic diagram of the second component and the first sealing member in an embodiment of the present application;

[0039] Fig.11 is a schematic diagram of the second component during rotation from the first position to the second position in the embodiment of the present application;

[0040] Fig.12 It is a schematic diagram of the second component during rotation from the second position to the third position in the embodiment of the present application.

[0041] Explanation of the accompanying drawings: 1. first component; 11. cylinder; 12. cover body; 13. third sealing member; 14. partition; 2. second component; 21. slot section; 211. center column; 212. supporting rib; 213. conducting port; 22. rod-shaped body; 23. extension portion; 231. rotating shaft; 3. first sealing member; 31. annular portion; 32. U-shaped portion; 4. damping liquid; 5. damping chamber; 6. sealing fitting section; 7. clearance fitting section; 71. guide groove; 8. accommodating chamber; 9. second sealing member. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The injection device can inject the medicine contained therein into the patient's body from the patient's injection site through a needle. It usually includes a shell, a medicine bottle, a starting mechanism and a pushing mechanism, wherein the medicine bottle is installed in the shell, and the medicine bottle includes a bottle body, a medicine placed in the bottle body, a needle at the far end of the bottle body and a movable piston at the proximal end of the bottle body. The pushing mechanism is used to push the movable piston to push the medicine in the bottle body from the needle into the patient's body, and the starting mechanism is used for the user to operate to trigger the pushing action of the pushing mechanism.

[0046] During the actual injection, the injected drug usually takes a while to be completely discharged from the medicine bottle, and the drug also takes a certain amount of time to disperse at the injection site. If the needle of the injection device is pulled out from the injection site immediately after the injection is completed, the drug may not be completely discharged from the medicine bottle, and / or the drug may flow out from the injection site, which may cause a portion of the drug to be incompletely injected into the patient. For this reason, some injection devices are equipped with a delay mechanism, which cooperates with the push mechanism. When the push mechanism pushes the movable piston of the medicine bottle to the farthest end, the delay action of the delay mechanism is triggered and a visual / auditory / tactile signal is given after a period of time to prompt the user to pull the needle out of the injection site at this time; and some injection devices further include a needle return mechanism for automatically removing the needle from the patient's injection site. The needle return mechanism cooperates with the delay mechanism. When the push mechanism pushes the movable piston of the medicine bottle to the farthest end, the delay action of the delay mechanism is triggered and the needle return action of the needle return mechanism is triggered after a period of time to automatically remove the needle from the patient's injection site.

[0047] In the related art, the delay mechanism mainly includes a delay component that can move and a damper for providing resistance for the delay component; wherein the delay component is usually powered by a power spring, and the damper cooperates with the delay component to form a damping chamber with a preset channel, and the damping chamber contains a high-viscosity liquid; the moving delay component will gradually compress the damping chamber and squeeze the high-viscosity liquid out of the damping chamber through the channel, and use the resistance of the high-viscosity liquid to delay the movement of the delay component to achieve the delay function, but some high-viscosity liquid may also flow out of the damping chamber through the channel before the delay mechanism is activated, which will reduce the total delay duration of the delay mechanism and affect the accuracy of the delay mechanism.

[0048] An embodiment of the present application discloses a delay mechanism, which can prevent damping liquid from flowing out of the damping chamber before the delay mechanism is activated, thereby ensuring the accuracy of the delay mechanism.

[0049] Reference Figures 1 to 12The time-delay mechanism comprises a first component 1, a second component 2, a first seal 3, a damping liquid 4 and a filling fluid; wherein the first component 1 is sleeved with the second component 2, and before the time-delay mechanism is activated, the second component 2 is in a first position relative to the first component 1; after the time-delay mechanism is activated, the second component 2 can move from the first position to the third position via the second position relative to the first component 1, Figure 1 and Figure 2 , Fig.11 and Fig.12 This is the movement process in some embodiments; at the same time, when the extension action of the delay mechanism is completed, the second component 2 is in a third position relative to the first component 1.

[0050] Specifically, when the second component 2 is in the first position, the first component 1, the second component 2 and the first seal 3 cooperate to form a damping chamber 5, the damping liquid 4 and the filling fluid are both contained in the damping chamber 5, and the damping chamber 5 is configured to prevent the damping liquid 4 from flowing out, so as to avoid the damping liquid 4 from flowing out of the damping chamber 5 before the delay mechanism is activated. During the movement of the second component 2 from the first position to the second position, the first component 1 and the second component 2 cooperate with each other through the first seal 3 to form a sliding sealing structure, which enables the first component 1 and the second component 2 to move relative to each other and form a seal through the first seal 3 to prevent the damping liquid 4 from passing through. During this period, the damping chamber 5 is compressed and the filling fluid is compressed and / or discharged; during the movement of the second component 2 from the second position to the third position, the damping chamber 5 is connected to a channel for the damping liquid 4 to flow out, so that the damping chamber 5 is compressed and the damping liquid 4 is squeezed out of the damping chamber 5, and resistance is provided for the movement of the second component 2 relative to the first component 1 during the process of the damping liquid 4 being squeezed out of the damping chamber 5, thereby realizing the delay function of the delay mechanism.

[0051] By adopting the above scheme, before the delay mechanism is triggered and started, the damping chamber 5 is in a sealed state to limit the outflow of the damping liquid 4, thereby effectively preventing the damping liquid 4 from flowing out of the damping chamber 5 before the delay mechanism is started and shortening the delay time, thereby ensuring the accuracy of the delay mechanism; and after the delay mechanism is triggered and started, the first component 1 will move a certain distance relative to the second component 2, compress the damping chamber 5 and form a channel for the damping chamber 5 for the damping liquid 4 to flow out, and continue to compress the damping chamber 5 in the subsequent movement of the first component 1, thereby squeezing the damping liquid 4 out of the damping chamber 5, and providing resistance to the movement of the first component 1 in the process of the damping liquid 4 being squeezed out, so as to delay the time for the first component 1 to move to the third position, thereby realizing the delay function of the delay mechanism.

[0052] It can be understood that the first component 1 and the second component 2 are nested, which means that a nesting relationship is formed between the two components; wherein, the first component 1 can be nested on the outside of the second component 2, or the second component 2 can be nested on the outside of the first component 1. Correspondingly, after the delay mechanism is activated, the second component 2 can move relative to the first component 1, which means that there is a relative position change relationship between the first component 1 and the second component 2; wherein, it can be a relative movement formed by the first component 1 being stationary and the second component 2 moving, or it can be a relative movement formed by the second component 2 being stationary and the first component 1 moving, or it can be a relative movement formed by the first component 1 and the second component 2 moving at the same time but with one of the speeds and directions of movement being different. At the same time, the first position, the second position and the third position all represent the relative position of the second component 2 based on the first component 1. It can be understood that the second component 2 being in the first position means that the second component 2 is in the first position relative to the first component 1.

[0053] It should be noted that the damping liquid 4 and the filling fluid are simultaneously contained in the damping chamber 5, which means that the total volume of the damping liquid 4 in this case is smaller than the total volume of the damping chamber 5, and the difference between the two is filled by the filling fluid. The damping liquid 4 is preferably a liquid with a relatively high dynamic viscosity. In some embodiments, a liquid with a dynamic viscosity of 5000cP to 100000cP can be selected as the damping liquid 4; in some more specific examples, the damping liquid 4 can be damping oil, silicone oil or glycerin. In addition, in some other embodiments, some liquids with relatively low dynamic viscosity can also be used. For example, in some embodiments, a liquid with a dynamic viscosity of less than 5000cP is selected as the damping liquid 4.

[0054] Accordingly, in some specific embodiments, the filling fluid is a filling gas, and the filling gas can be directly discharged as the damping chamber 5 is compressed, or it can be compressed as the damping chamber 5 is compressed; further, the filling gas can be a gas that does not chemically react with the damping liquid 4, and the filling gas can directly use air if the above requirements are met. In some other specific embodiments, the filling fluid is a filling liquid, and the filling liquid can be compressed as the damping chamber 5 is compressed; in some specific examples, the filling liquid is a liquid that does not chemically react with the damping liquid 4 and is easily compressed, preferably a volatile liquid; for example, alcohol, gasoline, kerosene, acetone, toluene, xylene, methanol, ether, chloroform, carbon tetrachloride, ammonia, acetic acid, benzene, formaldehyde or petroleum ether.

[0055] Furthermore, in some embodiments where the filling fluid is a filling gas, the damping chamber 5 during the movement of the second component 2 from the first position to the second position is configured to be closed to the gas, so that during this period, the filling gas in the damping chamber 5 is compressed as the damping chamber 5 is compressed; in other embodiments, the damping chamber 5 during the movement of the second component 2 from the first position to the second position is configured to allow gas to be discharged, and based on the different positions of the discharge port and the different usage postures of the injection device, the filling gas in the damping chamber 5 during actual use may be directly discharged as the damping chamber 5 is compressed, or may be partially discharged and partially compressed as the damping chamber 5 is compressed.

[0056] It should also be noted that, during the movement of the second component 2 relative to the first component 1 from the first position to the second position, the damping chamber 5 is in a state of restricting the outflow of the damping liquid 4, and during the movement of the second component 2 relative to the first component 1 from the second position to the third position, the damping chamber 5 is connected to a channel for the outflow of the damping liquid 4. The second position can be regarded as a critical position where the damping chamber 5 changes from restricting the outflow of the damping liquid 4 to allowing the outflow of the damping liquid 4; accordingly, in this scheme, the second position of the second component 2 relative to the first component 1 is defined as the position where the damping chamber 5 has just been connected to the outflow channel of the damping liquid 4.

[0057] In addition, the relative movement between the first component 1 and the second component 2 mentioned above can be a relative translation of the first component 1 and the second component 2, such as Figures 1 to 8 It can also be the relative rotation of the first component 1 and the second component 2, such as Figures 9 to 12 shown.

[0058] Some embodiments of the relative translation between the first component 1 and the second component 2 are introduced below.

[0059] Reference Figures 1 to 4 In some embodiments, the second component 2 translates relative to the first component 1 and moves from the first position to the third position via the second position; wherein the first component 1 is substantially cylindrical and includes a receiving space with a bottom, and the second component 2 is substantially cylindrical and extends into the receiving space of the first component 1. The end of the second component 2 extending into the receiving space and the bottom of the receiving space respectively constitute part of the cavity wall of the damping chamber 5; meanwhile, the central axes of the first component 1 and the second component 2 are collinear, and the second component 2 translates relative to the first component 1 in a direction parallel to the central axis.

[0060] Reference Figures 1 to 3In some specific examples, the first component 1 includes a cylinder 11, a cover 12 and a third sealing member 13, and an opening at one end of the cylinder 11 is covered by the cover 12 to form a receiving space with a bottom; at the same time, an annular groove is provided on the outer wall of the cylinder 11 covered by the cover 12, and the third sealing member 13 is an elastic sealing ring sleeved in the annular groove, and the outer wall of the third sealing member 13 is tightly pressed against the inner wall of the cover 12, so that the cylinder 11 and the cover 12 form a sealing structure through the third sealing member 13 to prevent the damping liquid 4 from flowing out. During the use of the injection device, the cover 12 of the first component 1 is usually on the upper side, so that the filling air is on the side closer to the cover 12 relative to the damping liquid 4. If the sealing structure formed by the cover body 12 and the cylinder body 11 through the third sealing member 13 is configured to allow the filling gas to pass through, during the movement of the second component 2 relative to the first component 1 from the first position to the second position, the damping chamber 5 is compressed and the filling gas is directly discharged; if the sealing structure formed by the cover body 12 and the cylinder body 11 through the third sealing member 13 is configured to prevent the filling gas from passing through, during the movement of the second component 2 relative to the first component 1 from the first position to the second position, the damping chamber 5 is compressed and the filling gas is compressed.

[0061] Reference Figure 4 In some specific examples, the barrel wall and the barrel bottom of the first component 1 are integrally formed to form a receiving space with a bottom; accordingly, during the use of the injection device, the bottom of the receiving space is at the upper side, so that the filling space is closer to the bottom of the receiving space relative to the damping liquid 4. During the movement of the second component 2 from the first position to the second position relative to the first component 1, the damping chamber 5 is compressed to compress the filling fluid.

[0062] Further, in some embodiments in which the second component 2 translates relative to the first component 1, the first seal 3 is disposed between the first component 1 and the second component 2, and one of the first component 1 and the second component 2 remains stationary relative to the first seal 3, and the other includes a seal fitting section 6 and a clearance fitting section 7. During the movement of the second component 2 from the first position to the second position, the first seal 3 cooperates with the seal fitting section 6 so that the first component 1 and the second component 2 form a sliding seal structure through the first seal 3; during the movement of the second component 2 from the second position to the third position, the first seal 3 cooperates with the clearance fitting section 7 so that a gap exists between the first seal 3, the first component 1 and the second component 2 to form a channel for the damping liquid 4 to flow out of the damping chamber 5.

[0063] Reference Figure 1 , Figure 5 and Figure 6In some specific embodiments, the first component 1 is sleeved on the outside of the second component 2, the first seal 3 is a sealing ring, and the first seal 3 is fixedly sleeved in the annular groove on the outer wall of the second component 2 to keep the first seal 3 and the second component 2 relatively stationary, and the inner wall of the first component 1 includes a sealing fitting section 6 and a clearance fitting section 7 distributed along the translation direction of the second component 2. Among them, the first component 1 is tightly pressed against the first seal 3 at the inner wall of the sealing fitting section 6 and can slide relatively, thereby realizing a sliding sealing structure between the first component 1 and the second component 2 at the first seal 3; at the same time, the first component 1 has a gap with the first seal 3 at the inner wall of the clearance fitting section 7, thereby forming a channel for the damping liquid 4 to flow out. For details, refer to Figure 1 and Figure 4 In some specific examples, the sealing fitting section 6 and the clearance fitting section 7 of the first component 1 are both in the cylinder 11, and the cylinder 11 of the first component 1 is provided with a guide groove 71 extending along the translation direction on the inner wall of the clearance fitting section 7, and the groove bottom of the guide groove 71 has a gap with the first sealing member 3 to form a channel for the damping liquid 4 to flow out; refer to Figure 1 and Figure 5 In other specific examples, the sealing fit section 6 and the clearance fit section 7 of the first component 1 are both in the cylinder 11, and the cylinder 11 of the first component 1 has a larger inner diameter than the sealing fit section 6 in the clearance fit section 7, so that the first component 1 is isolated from the first seal 3 in the clearance fit section 7 to form a channel for the damping liquid 4 to flow out.

[0064] In other specific embodiments, the first component 1 is sleeved on the outside of the second component 2, the first seal 3 is configured as a sealing ring embedded in the annular groove on the inner wall of the first component 1, and the second component 2 is configured such that the outer wall includes a sealing fitting section 6 and a clearance fitting section 7 distributed along the translation direction. Among them, the second component 2 is pressed against the first seal 3 at the outer coin of the sealing fitting section 6 and can slide relatively, so as to realize the sliding sealing structure between the first component 1 and the second component 2 at the first seal 3; at the same time, the outer wall of the second component 2 at the clearance fitting section 7 has a gap with the first seal 3, so as to form a channel for the damping liquid 4 to flow out. In some specific examples, the second component 2 is provided with a guide groove 71 extending along the translation direction on the outer wall of the clearance fitting section 7, and the groove bottom of the guide groove 71 has a gap with the first seal 3 to form a channel for the damping liquid 4 to flow out; in other specific examples, the second component 2 has a smaller outer diameter than the sealing fitting section 6 at the clearance fitting section 7, so that the second component 2 is separated from the first seal 3 at the clearance fitting section 7 to form a channel for the damping liquid 4 to flow out.

[0065] Furthermore, combined with Figure 7 and Figure 8The time-delay mechanism further includes a second seal 9, and the first component 1, the second component 2, the first seal 3 and the second seal 9 cooperate to form a receiving chamber 8; during the movement of the second component 2 from the second position to the third position, the channel for the damping liquid 4 to flow out of the damping chamber 5 is connected to the receiving chamber 8, so that the damping liquid 4 can be squeezed to flow from the damping chamber 5 to the receiving chamber 8. In addition, in some embodiments, in order to form a stable receiving chamber 8, one of the first component 1 and the second component 2 remains stationary relative to the second seal 9 and is provided with a slot body section 21, and the other slides relative to the second seal 9 and maintains sealing, and the slot body section 21 is between the first seal 3 and the second seal 9 and constitutes a part of the cavity wall of the receiving chamber 8. Further, in some specific examples, the slot body section 21 includes support ribs 212 arranged at intervals, and a slot body is formed between two adjacent support ribs 212, and the support rib 212 is provided with a conducting port 213 for conducting two adjacent slot bodies, so that the damping liquid 4 can flow between adjacent slot bodies.

[0066] Reference Figure 1 , Figure 7 and Figure 8 In some embodiments, the first component 1 is sleeved on the outside of the second component 2, and the first seal 3 and the second seal 9 are elastic seal rings sleeved in the annular groove of the outer wall of the second component 2; the second seal 9 is located on the side of the first seal 3 away from the damping chamber 5, so that the first component 1, the second component 2, the first seal 3 and the second seal 9 cooperate to form the accommodating chamber 8, and the first seal 3 forms the boundary area between the damping chamber 5 and the accommodating chamber 8, so that the first seal 3 cooperates with the aforementioned clearance fitting section 7 to form a channel for the damping liquid 4 to flow out, which can connect the damping chamber 5 with the accommodating chamber 8. Among them, the first component 1 and the second component 2 form a sliding sealing structure through the arrangement of the second seal 9, and the sliding sealing structure is configured to prevent the damping liquid 4 from passing through.

[0067] Furthermore, the second component 2 can drive the third seal 13 to move relative to the first component 1, and during the movement, the third seal 13 slides relative to the inner wall of the first component 1 and maintains a tight seal; at the same time, the second component 2 has a slot section 21 between the first seal 3 and the second part, and the slot section 21 never constitutes a partial cavity wall of the accommodating chamber 8. Specifically, the slot section 21 includes a centrally arranged center column 211 and support ribs 212 evenly distributed around the center column 211, and these support ribs 212 are used to increase the support strength of the slot section 21; at the same time, a slot for accommodating the damping liquid 4 is formed between two adjacent support ribs 212, and accordingly, the support rib 212 also serves as a baffle structure separating two adjacent slots, and in order to facilitate the circulation of the damping liquid 4 between adjacent slots, a conducting port 213 connecting the two adjacent slots is also provided on the support rib 212. Refer to Figure 7 and Figure 8 In a specific example, in order to facilitate the forming of the conducting opening 213, the conducting opening 213 is set as a recess at the edge of the support rib 212 radially away from the center column 211, and the number of the conducting openings 213 can be set to one or more based on needs.

[0068] Some embodiments of the relative rotation between the first component 1 and the second component 2 are introduced below.

[0069] Reference Figures 9 to 12 In some embodiments, the second component 2 rotates relative to the first component 1 to move from the first position to the third position via the second position.

[0070] Specific reference Fig. 9 In some specific examples, the first component 1 is roughly cylindrical, and the first component 1 includes a containing space with a bottom, and the second component 2 is roughly rod-shaped, and the second component 2 extends into the containing space of the first component 1. At the same time, the central axes of the first component 1 and the second component 2 are colinear, and the second component 2 rotates relative to the first component 1 around the central axis. In some embodiments, the first component 1 includes a cylinder 11, a cover 12 and a third sealing member 13, and an opening at one end of the cylinder 11 is covered by the cover 12 to form a containing space with a bottom; at the same time, the outer wall of the cylinder 11 covered by the cover 12 is provided with an annular groove, and the third sealing member 13 is an elastic sealing ring sleeved in the annular groove, and the outer wall of the third sealing member 13 is tightly pressed against the inner wall of the cover 12, so that the cylinder 11 and the cover 12 form a sealing structure through the third sealing member 13 to prevent the damping liquid 4 from flowing out. In some other embodiments, the cylinder wall and the cylinder bottom of the first component 1 are integrally formed to form a containing space with a bottom.

[0071] Specifically, refer to Fig. 9 , Fig.10 and Fig.11 The second component 2 includes a circular rod-shaped body 22 and a flat extension 23 at the end of the rod-shaped body 22. The extension 23 and part of the rod-shaped body 22 of the second component 2 extend into the accommodation space of the first component 1. At the same time, the extension 23 includes a rotating shaft 231. The inner wall of the cylinder 11 of the first component 1 is symmetrically provided with two partitions 14. The two partitions 14 are tightly pressed against the rotation shaft 231 of the extension 23 to form a sealing matching structure to prevent the damping liquid from passing through. The first sealing member 3 includes an annular portion 31 and a U-shaped portion 32, wherein the annular portion 31 is fixedly embedded in the annular groove on the outer wall of the rod-shaped body 22 of the second component 2, and the U-shaped portion 32 is fixedly embedded in the U-shaped groove extending from the extension 23 of the second component 2. When the second component 2 and the first component 1 are assembled, the inner wall of the first component 1 and the rod-shaped body 22 of the second component 2 form a sealing matching structure through the annular portion 31 of the first sealing member 3, and the sealing matching structure can prevent the damping liquid 4 from passing through.

[0072] Further, refer to Fig.11 During the movement of the second component 2 from the first position to the second position, the inner wall of the first component 1 and the extension 23 of the second component 2 can form a sealing matching structure through the U-shaped portion 32 of the first sealing member 3 to prevent the damping liquid 4 from passing through; at this time, the inner wall of the first component 1, the partition 14 of the first component 1, the rod-shaped body 22 of the second component 2, the extension 23 of the second component 2 and the first sealing member 3 form four chambers, two of which are gradually compressed as the second component 2 moves as the damping chamber 5 for accommodating the damping liquid 4 and the filling fluid, and the other two chambers are gradually expanded as the second component 2 moves as the accommodating chamber 8. During the movement of the second component 2 from the first position to the second position, the damping chamber 5 is gradually compressed and the accommodating chamber 8 is gradually expanded, and the filling fluid in the damping chamber 5 is compressed or squeezed into the accommodating chamber 8.

[0073] Combination Fig.11 and Fig.12 The inner side wall of the first component 1 includes a sealing fitting section 6 and a clearance fitting section 7, wherein the sealing fitting section 6 is tightly sealed against the U-shaped section 32 of the first sealing ring, and the clearance fitting section 7 forms a gap with the U-shaped section 32 of the first seal by setting a groove on the side wall or increasing the inner diameter compared to the sealing fitting section 6, so that the damping chamber 5 and the accommodating chamber 8 form a channel for the damping liquid 4 to flow. Accordingly, during the movement of the second component 2 from the second position to the third position, the damping chamber 5 is gradually compressed and the accommodating chamber 8 is gradually expanded, and the damping liquid 4 in the damping chamber 5 is slowly squeezed to the accommodating chamber 8, and the damping liquid 4 provides resistance to the rotation of the second component 2, delaying the time for the second component 2 to rotate to the third position, thereby realizing the delay function.

[0074] The embodiment of the present application also discloses an injection device, which includes a pushing mechanism and the above-mentioned delay mechanism. When the pushing action of the pushing mechanism is completed, the relative movement between the first component and the second component in the delay mechanism is triggered; when the first component moves to a third position relative to the second component, the delay action is completed and a prompt signal is given. The prompt signal can be a visual signal, an auditory signal or a tactile signal, and the user can pull the needle out of the injection site based on the prompt signal.

[0075] An embodiment of the present application also discloses an injection device, which includes a pushing mechanism, a needle return mechanism and the delay mechanism mentioned above. When the pushing action of the pushing mechanism is completed, the relative movement between the first component and the second component in the delay mechanism is triggered; when the first component moves to a third position relative to the second component, the delay action is completed and the automatic needle return action of the needle return mechanism is triggered, and the needle return mechanism pulls out the needle from the injection site.

[0076] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A time delay mechanism, characterized in that: comprising a first component, a second component, a first seal, a damping liquid, and a filling fluid; The first component is sleeved with the second component, and the second component can move from a first position to a third position via a second position relative to the first component; When the second component is in the first position, the first component, the second component and the first sealing member cooperate to form a damping chamber for preventing the damping liquid from flowing out, and the damping liquid and the filling fluid are contained in the damping chamber; During the movement of the second component from the first position to the second position, the first component cooperates with the second component through the first seal to form a sliding seal structure that blocks the damping liquid from passing through, and the damping chamber is compressed and compresses and / or discharges the filling fluid; During the movement of the second component from the second position to the third position, the damping chamber is connected with a passage for the damping liquid to flow out, the damping chamber is compressed and the damping liquid is squeezed out of the damping chamber.

2. The time delay mechanism according to claim 1, characterized in that: The first seal is located between the first component and the second component, and one of the first component and the second component remains stationary relative to the first seal, and the other includes a sealing fit section and a clearance fit section; During the movement of the second component from the first position to the second position, the first sealing member cooperates with the sealing cooperation section so that the first component and the second component form the sliding sealing structure through the first sealing member; During the movement of the second component from the second position to the third position, the first seal cooperates with the clearance fitting section to provide a gap among the first seal, the first component and the second component to form a channel for the damping liquid to flow out of the damping chamber.

3. The time delay mechanism according to claim 2, characterized in that: A guide groove is provided on the surface of the clearance fitting section, and a gap exists between the groove bottom of the guide groove and the first sealing member to form a channel for the damping liquid to flow out of the damping chamber.

4. The time delay mechanism according to claim 1, characterized in that: The delay mechanism also includes a accommodating chamber. During the movement of the second component from the second position to the third position, the channel connected to the damping chamber for the damping liquid to flow out is connected to the accommodating chamber, and the damping liquid can be squeezed to flow from the damping chamber to the accommodating chamber.

5. The time delay mechanism according to claim 4, characterized in that: The delay mechanism also includes a second seal, and the first component, the second component, the first seal and the second seal cooperate to form the accommodating chamber; one of the first component and the second component remains stationary relative to the second seal and is provided with a groove body section, and the other slides relative to the second seal and maintains a seal, and the groove body section is located between the first seal and the second seal and constitutes a partial cavity wall of the accommodating chamber.

6. The time delay mechanism according to claim 5, characterized in that: The slot body section comprises support ribs arranged at intervals, a slot body is formed between two adjacent support ribs, and the support rib is provided with a conducting opening for conducting the two adjacent slot bodies.

7. The time delay mechanism according to claim 1, characterized in that: The first component includes a containing space with a bottom, a section of the second component extends into the containing space, and the end of the second component extending into the containing space and the bottom of the containing space respectively constitute part of the cavity wall of the damping chamber.

8. The time delay mechanism according to claim 7, characterized in that: The first component includes a cylinder, a cover and a third sealing member. An opening at one end of the cylinder is covered by the cover to form the accommodating space with a bottom. The cylinder and the cover form a sealing structure through the third sealing member to prevent the damping liquid from flowing out.

9. The time delay mechanism according to claim 1, characterized in that: The first component translates relative to the second component to move from the first position to the third position via the second position; or the first component rotates relative to the second component to move from the first position to the third position via the second position.

10. An injection device, characterized in that: It comprises a pushing mechanism and a delay mechanism as claimed in any one of claims 1 to 9, and when the pushing action of the pushing mechanism is completed, the relative movement between the first component and the second component in the delay mechanism is triggered; When the first component moves to the third position relative to the second component, a prompt signal is given, and / or when the first component moves to the third position relative to the second component, a needle return action is triggered.

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